[3.6] bpo-31293: Fix crashes in truediv and mul of a timedelta by a float with a bad as_integer_ratio() method. (GH-3227) (#3654)

(cherry picked from commit 865e4b4f630e2ae91e61239258abb58b488f1d65)

1 files changed, 20 insertions, 0 deletions

diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index b25e6c1..77df1b3 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -846,6 +846,26 @@ class TestTimeDelta(HarmlessMixedComparison, unittest.TestCase):
 
         self.assertRaises(TypeError, divmod, t, 10)
 
+    def test_issue31293(self):
+        # The interpreter shouldn't crash in case a timedelta is divided or
+        # multiplied by a float with a bad as_integer_ratio() method.
+        def get_bad_float(bad_ratio):
+            class BadFloat(float):
+                def as_integer_ratio(self):
+                    return bad_ratio
+            return BadFloat()
+
+        with self.assertRaises(TypeError):
+            timedelta() / get_bad_float(1 << 1000)
+        with self.assertRaises(TypeError):
+            timedelta() * get_bad_float(1 << 1000)
+
+        for bad_ratio in [(), (42, ), (1, 2, 3)]:
+            with self.assertRaises(ValueError):
+                timedelta() / get_bad_float(bad_ratio)
+            with self.assertRaises(ValueError):
+                timedelta() * get_bad_float(bad_ratio)
+
 
 #############################################################################
 # date tests